2020 Cilt 1 Sayı 2

Permanent URI for this collectionhttps://hdl.handle.net/11452/27953

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    Development of alternative methods for determination of acrylamide and caffeine in coffee samples
    (Bursa Uludağ Üniversitesi, 2020-08-21) Kuruca, Büşra; İzgi, Belgin; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü Lisans Öğrencisi.; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0002-9177-6992; 0000-0002-1074-3612
    Acrylamide which has gained attention in recent years is a composition resulting from the heat treatment process of foods. By the IARC, it is listed in Group 2A as a possible carcinogenic substance for humans. Caffeine is a nitrogenous natural compound of the alkaloid group, which has crucial physiological effects. There are numerous analytical methods within the literature for acrylamide and caffeine determination. These methods are GC-MS, LC-MS, voltammetry, ion chromatography, FTIR, GC-EDC, LC- MS/MS, and GC-IT/MS. Also, organic molecules could be identified via the complexation with metals. It is well known that the Job Method is determining the formation rate of the complex between metals and organic molecules in a certain mixture. In this project, an alternative method was tried to determine the CA and AA amount in coffee samples. First of all, the metal complexes of CA and AA formed with Cu and Co were determined as 1:1 according to Job's Method by UV-VIS Spectrophotometer. After optimum conditions were set, standard solutions and coffee samples were measured at 252.0 nm (for CA) and 272.0 nm (for AA). Based on the data obtained, the amounts of acrylamide and caffeine were determined in commercial coffee samples.
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    On the diagnosis and analysis of an automotive fuel pump noise
    (Bursa Uludağ Üniversitesi, 2020-08-11) Yağcı, Ayhan; Meriç, Cem; Özkan, Aytekin
    This study aims to solve a low-frequency tonal fuel pump noise involving a roller-cell type of fuel pump located inside a metal fuel tank. Firstly, possible noise transmission paths are investigated. Then, the contribution of each component and/or the boundary condition to the fuel pump noise phenomenon is investigated step by step mainly with experimental methods. The effect of the differences in the structural design of the pump, sub-components ve interfaces are tested and analyzed. Finally, the solution alternatives are discussed and the proposed solution is tested and verified through objective NVH tests. It is shown that a 10 dB improvement in noise level can be obtained with the application of the proposed solution.